I am trying to work in Web2py's union method and am wondering a few things

if I have a query

*db( (db.sample.id>0) and (db.example.id>0) and (db.random.id>0)).select()*

I would like to know how to orderby the latest ids

as well when I am displaying a page link *<a href="{{=URL('view', 'page1',
args=row.id)}}* or whatever I may have a another page to link to with in
the loop *<a href="{{=URL('view', 'page2', args=row.id)}}
*
How can I do a check to see what table I am selecting from

if row == table1:
   display_this_link
elif row == table2:
   display 2nd link

*cheers

and ty :-)

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